Okay, first of all, you need to remove any CSS or XML you are using and replace it all with nested tables.
If you have any inlined JPGs, be sure to display them at a resolution different than that of the file.
Under no circumstances should an image be larger than 100x80!
Instead of organizing your pages hierarchically, users should navigate via a single list of every page on the entire site. If your site has a lot of pages, reduce the font size of this list until it all fits on the screen.
You may wish to call out important pages with a small banner ad. Put the nine or ten most important of these "call outs" in the rightmost nested table.
Remember: when in doubt, make a list! more information is always better. Users will read the entire page and figure out what they need.
Finally, make sure the site doesn't work with Firefox; ideally, it should redirect Firefox users to download IE 6.0.
Hope these tips help!